#include <stdio.h>
void cubic(double n);
int main(void)
{
    double n;

    printf("Enter a double number: ");
    scanf("%lf", &n);
    cubic(n);

    return 0;
}

void cubic(double n) 
{
    double cubic_n;
    
    cubic_n = n * n * n;
    printf("%lf\n", cubic_n);
}